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Isolation and Characterization of Cyanobacterial Extracellular Vesicles
Published on: February 3, 2022
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Paraclostridium sp. AKS46 vesicles facilitate extracellular electron transport
Aparajita Basu1, Sangita Mondal2, Aindrila Roy3
1Department of Microbiology, University of Calcutta, Kolkata - 700019, India.
Journal of Applied Microbiology
|September 24, 2025
Summary
Membrane vesicles (MVs) from Paraclostridium sp. AKS46 act as electron transporters, enhancing exoelectrogenic activity. This discovery reveals a novel vesicle-mediated mechanism for energy harvesting in microbial fuel cells.
Area of Science:
- Microbiology
- Electrochemistry
- Biotechnology
Background:
- Paraclostridium sp. AKS46 exhibits significant exoelectrogenic activity.
- The role of membrane vesicles (MVs) in this electrogenic process was previously unclear.
Purpose of the Study:
- To investigate the contribution of MVs to the electrogenic activity of Paraclostridium sp. AKS46.
- To characterize the electrochemical properties and molecular composition of these MVs.
Main Methods:
- Microscopic analysis of MV formation during AKS46 growth.
- Purification and electrochemical characterization (cyclic voltammetry, impedance spectroscopy) of MVs.
- Proteomic analysis to identify redox-active proteins within MVs.
Main Results:
- MV formation increased with culture time, particularly in electrode-attached cells.
- Purified AKS46 MVs demonstrated strong redox activity and high electrochemical properties.
- Proteomic analysis identified flavoproteins and enzymes involved in CO2 and nitrogen fixation in MVs.
Conclusions:
- AKS46 MVs are rich in electron-rich molecules and function as electron transporters.
- A vesicle-mediated mechanism facilitates energy harvesting from waste degradation.
- This finding has implications for microbial fuel cell technology and nutrient cycling.
Keywords:
Fe-rich moleculeelectrochemical activityexoelectrogenic bacteriaextracellular vesiclesflavoproteinsMore Related Videos
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